管中泵控制柜的漏电保护怎么做？管中泵变频器能配漏电保护器吗？

管中泵控制柜的漏电保护怎么做？管中泵变频器能配漏电保护器吗？
管中泵控制柜有直接启动、星三角启动、自耦降压启动、软启动和变频这几种方式，为什么变频启动的时候，管中泵的变频器能不能配漏电保护器呢？ 使用变频器时不要使用漏电保护器。这是变频器的一大原理。有些用户在使用变频器时，会为变频器选择相应的漏电保护器。最终的结果是：如果逆变器一起工作，漏电保护器就会动作，系统根本无法运行。为什么？漏电保护器的原理是零序电流为零。使用变频器时，零序电流不能为零。逆变器输出侧为PWM波，VAREM管中泵电机电缆与地之间存在长电缆电容效应。采用屏蔽层电缆时，电容效应更为明显。WATERSUNNY管中泵变频器工作时，电容器充放电，电流通过电容器流入大地，然后从进线侧的地线流回变频器，形成电流回路。如果在进线侧使用漏电保护器，它将起到切断系统运行的作用。不要为逆变器安装漏电保护器。如果要保证安全，就要做好设备接地。案例：Q:18.5kw管中泵安装18.5kw变频器。变频器安装好后，就会启动，配电室的开关也会跳起来。原来配电室的每条回路都装了漏电保护器（200mA动作，30mA脉冲）。客户拒绝拆除漏电保护后，将载频调整为1kHz，并改变变频器的启动方式。最后怀疑电机电源线有泄漏，因为长约20米，埋在地下，但很难更换（原电源频率正常）。那么有没有简单有效的解决办法呢？A： 当三相不平衡度超过20%时，漏电保护器跳闸。逆变器安装后，三相不平衡度一般超过50%，漏电保护器必然跳闸。以下几种方法：方法一：漏电保护器一般都会有一个调节器，调节器可以调大；方法二：漏电保护器是用变频器专用漏电保护器代替的，市场上有卖变频器专用漏电保护器。方法三：增加ZILMET管中泵设备的负载，即电机负载，启动时逆变器的泄漏电流不会很大。方法四：使漏电保护器短路。
How to do leakage protection of pump control cabinet in pipe? Can the frequency converter of pipe pump be equipped with leakage protector?
There are direct start, star delta start, auto step-down start, soft start and frequency conversion in the control cabinet of pipe pump. Why can the frequency converter be equipped with leakage protector when frequency conversion starts? Do not use leakage protector when using frequency converter. This is a principle of frequency converter. When some users use the frequency converter, they will choose the corresponding leakage protector for the frequency converter. The final result is: if the inverters work together, the leakage protector will act, and the system can't run at all. Why? The principle of leakage protector is zero sequence current. When using frequency converter, zero sequence current cannot be zero. The output side of the inverter is PWM wave, and there is a long cable capacitance effect between the cable of the varem motor and the ground. When shielded cables are used, the capacitance effect is more obvious. When the pump frequency converter in watersunny works, the capacitor is charged and discharged, and the current flows into the earth through the capacitor, and then flows back to the frequency converter from the ground wire on the incoming side, forming a current loop. If the leakage protector is used on the incoming side, it will cut off the operation of the system. Do not install leakage protector for inverter. If we want to ensure safety, we must do a good job of equipment grounding. Case: Q: 18.5kw frequency converter is installed on 18.5kw in pipe pump. After the frequency converter is installed, it will start and the switch in the distribution room will jump up. Each circuit of the original distribution room is equipped with leakage protector (200mA action, 30mA pulse). After the customer refused to remove the leakage protection, the carrier frequency was adjusted to 1kHz and the starting mode of the inverter was changed. Finally, it was suspected that there was leakage in the power line of the motor, because it was about 20 meters long and buried underground, but it was difficult to replace (the original power frequency was normal). So is there a simple and effective solution? A: When the three-phase unbalance exceeds 20%, the leakage protector will trip. After the inverter is installed, the three-phase unbalance is generally more than 50%, and the leakage protector will trip. The following methods: Method 1: the leakage protector generally has a regulator, which can be adjusted larger; method 2: the leakage protector is replaced by the special leakage protector for frequency converter, and the special leakage protector for frequency converter is sold on the market. Method 3: increase the load of the pump equipment in the zilmet tube, that is, the motor load, and the leakage current of the inverter will not be very large when starting. Method 4: short circuit the leakage protector.